US173370A - Improvement in cases for pulley-blocks - Google Patents

Description

M. H. TARIBOX.

CASE FOR PULLEY-BLOCKS.

No.173,370. Patented Feb. 8,1876.

Wigwam: (1 17271671701! NJEIERS. PHOT0-LITNOGR APNER, WASHKNGTON D C UNITED STATES PATENT OFF CE.

MYRON H. TARBoX oE LOGKPORT, NEW YORK.

IMPROVEMENT IN CASES FOR PULLEY-BLOCKS.

Specification forming part of Letters Patent No. 173,370, dated February 8, 1876; application filed January 22, 1876.

To all whom itmay concern:

Be it known that I, MYRON H. TABBOX, of Lockport, in the county of Niagara and State of New York, have invented certain Improvements in Case for Pulley-Blocks, of which the following is a specification:

This invention consists of a metal case for pulley-blocks, having its edges projecting beyond the edge of the pulley or sheave, and curved outward at each side, for the twofold purpose ofstrengthening the same and preventing the chafing or wearing of the rope, as hereinafter more fully described.

Figure 1 is a perspective view, and Fig. 2 is a transverse section, of a pulley-block embodying the improvement.

It has become customary of late to construct the pulleys and their cases of metal. As heretot'ore constructed, these cases have beenv made of two flat pieces of plate or sheet metal, of wrought-iron, with a vertical bar at the center on each side, for strengthening the same, and affording support for the axis and the swivel-hook and loop or eye at the ends. The side plates A projected but little, if any, beyond the edge of the sheave and were left plain or flat, which rendered them liable to be bruised or bent inward by rough usage, thus causing them to rub against the sheave, there- I by creating friction,and preventing the latter from playing freely, as it should. In addition to this, these edges of the plates were apt to fray or wear the rope, especially when the latter happened to be drawn to one side, as it isv liable to be at times.

To remedy these defects is the object of the present invention, and for this purpose the case is made as represented in the drawings.

The case is made, as before, of two metal plates, A, with the side bars B. The plates A, as shown in Figs. 1 and 2, are made wider at the center, so as to project at each side some distance beyond the rim of the sheave, and the projecting edges are curved outward, as shown at a, Fig. 2. j

By this method of constructing the case, it will be seen that it is rendered much stronger in cross-section, and is thereby rendered much less liable to be dented or crowded inward against the sheave at these points. These curved edges a also present a smooth rounded surface, which prevents the rope from being frayed or cut when drawn across them, as happens more or less frequently.

In the drawing I have represented a sheave, D, made of iron, provided with a series of friction-rollers e, as shown in Fig. 2, which is the style ordinarily used by me; but it is obvious that any style of sheave may be used with my improved case, and that the benefits of theimprovements will -be the same whatever the style of sheave may be.

I am aware that a case for a pulley-block has been made in which the rounded edges of the case extended down about midway ot' the sheave, with a means of securing it at one end only, and therefore I do not. claim such a case;

but,

Having described my invention, what I claim '1. A case for pulley-blocks, consisting of the side plates A, flaring outward above and below the horizontal axis of the sheave, substantially as shown and described.

2. A case for pulley-blocks, consisting of the plates A, having the projecting and outwardly-flaring edges a and the side bars B, v

with a swivel at one end and a hook at the other end, substantiallyas shown and described.

MYRON H. TARBOX.

Witnesses:

J EssE PETERSON, JOHN J. PowERs.

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